// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('../../lib/codemirror'));
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['../../lib/codemirror'], mod);
  // Plain browser env
  else mod(CodeMirror);
})(function(CodeMirror) {
  'use strict';

  var Pos = CodeMirror.Pos;

  function getHints(cm, options) {
    var tags = options && options.schemaInfo;
    var quote = (options && options.quoteChar) || '"';
    if (!tags) return;
    var cur = cm.getCursor(),
      token = cm.getTokenAt(cur);
    if (token.end > cur.ch) {
      token.end = cur.ch;
      token.string = token.string.slice(0, cur.ch - token.start);
    }
    var inner = CodeMirror.innerMode(cm.getMode(), token.state);
    if (inner.mode.name != 'xml') return;
    var result = [],
      replaceToken = false,
      prefix;
    var tag = /\btag\b/.test(token.type) && !/>$/.test(token.string);
    var tagName = tag && /^\w/.test(token.string),
      tagStart;

    if (tagName) {
      var before = cm.getLine(cur.line).slice(Math.max(0, token.start - 2), token.start);
      var tagType = /<\/$/.test(before) ? 'close' : /<$/.test(before) ? 'open' : null;
      if (tagType) tagStart = token.start - (tagType == 'close' ? 2 : 1);
    } else if (tag && token.string == '<') {
      tagType = 'open';
    } else if (tag && token.string == '</') {
      tagType = 'close';
    }

    if ((!tag && !inner.state.tagName) || tagType) {
      if (tagName) prefix = token.string;
      replaceToken = tagType;
      var cx = inner.state.context,
        curTag = cx && tags[cx.tagName];
      var childList = cx ? curTag && curTag.children : tags['!top'];
      if (childList && tagType != 'close') {
        for (var i = 0; i < childList.length; ++i)
          if (!prefix || childList[i].lastIndexOf(prefix, 0) == 0) result.push('<' + childList[i]);
      } else if (tagType != 'close') {
        for (var name in tags)
          if (
            tags.hasOwnProperty(name) &&
            name != '!top' &&
            name != '!attrs' &&
            (!prefix || name.lastIndexOf(prefix, 0) == 0)
          )
            result.push('<' + name);
      }
      if (cx && (!prefix || (tagType == 'close' && cx.tagName.lastIndexOf(prefix, 0) == 0)))
        result.push('</' + cx.tagName + '>');
    } else {
      // Attribute completion
      var curTag = tags[inner.state.tagName],
        attrs = curTag && curTag.attrs;
      var globalAttrs = tags['!attrs'];
      if (!attrs && !globalAttrs) return;
      if (!attrs) {
        attrs = globalAttrs;
      } else if (globalAttrs) {
        // Combine tag-local and global attributes
        var set = {};
        for (var nm in globalAttrs) if (globalAttrs.hasOwnProperty(nm)) set[nm] = globalAttrs[nm];
        for (var nm in attrs) if (attrs.hasOwnProperty(nm)) set[nm] = attrs[nm];
        attrs = set;
      }
      if (token.type == 'string' || token.string == '=') {
        // A value
        var before = cm.getRange(
          Pos(cur.line, Math.max(0, cur.ch - 60)),
          Pos(cur.line, token.type == 'string' ? token.start : token.end),
        );
        var atName = before.match(/([^\s\u00a0=<>\"\']+)=$/),
          atValues;
        if (!atName || !attrs.hasOwnProperty(atName[1]) || !(atValues = attrs[atName[1]])) return;
        if (typeof atValues == 'function') atValues = atValues.call(this, cm); // Functions can be used to supply values for autocomplete widget
        if (token.type == 'string') {
          prefix = token.string;
          var n = 0;
          if (/['"]/.test(token.string.charAt(0))) {
            quote = token.string.charAt(0);
            prefix = token.string.slice(1);
            n++;
          }
          var len = token.string.length;
          if (/['"]/.test(token.string.charAt(len - 1))) {
            quote = token.string.charAt(len - 1);
            prefix = token.string.substr(n, len - 2);
          }
          replaceToken = true;
        }
        for (var i = 0; i < atValues.length; ++i)
          if (!prefix || atValues[i].lastIndexOf(prefix, 0) == 0)
            result.push(quote + atValues[i] + quote);
      } else {
        // An attribute name
        if (token.type == 'attribute') {
          prefix = token.string;
          replaceToken = true;
        }
        for (var attr in attrs)
          if (attrs.hasOwnProperty(attr) && (!prefix || attr.lastIndexOf(prefix, 0) == 0))
            result.push(attr);
      }
    }
    return {
      list: result,
      from: replaceToken ? Pos(cur.line, tagStart == null ? token.start : tagStart) : cur,
      to: replaceToken ? Pos(cur.line, token.end) : cur,
    };
  }

  CodeMirror.registerHelper('hint', 'xml', getHints);
});
